Acute p‑synephrine ingestion increases whole‑body fat oxidation during 1‑h of cycling at Fatmax
Identificadores
URI: http://hdl.handle.net/20.500.12020/1259ISSN: 1436-6215
DOI: 10.1007/s00394-019-02101-6
Fecha
2019-11-05Tipo de documento
articleÁrea/s de conocimiento
Ciencias de la Actividad Física y del DeporteMateria/s Unesco
3206 Ciencias de la NutriciónResumen
Purpose: p-Synephrine, the principal alkaloid of bitter orange (Citrus aurantium), is widely used in dietary supplements for weight loss due to its purported effect of increasing fat oxidation. However, there is a paucity of scientific information about its effectiveness in enhancing fat oxidation during exercise. The aim of this investigation was to determine the effect of an acute dose of p-synephrine on substrate oxidation during prolonged and constant intensity exercise.
Methods: In a double-blind and randomized experiment, 14 healthy subjects performed two acute experimental trials after ingesting either p-synephrine (3 mg kg-1) or a placebo (cellulose). Energy expenditure and fat oxidation rates were continuously measured by indirect calorimetry during 1 h of continuous cycling at Fatmax, the intensity that induces maximal fat oxidation rate.
Results: In comparison to the placebo, energy expenditure during 1 h of cycling remained unchanged with p-synephrine (698 ± 129 vs. 686 ± 123 kcal, P = 0.08). However, p-synephrine increased whole-body fat oxidation (33.6 ± 10.4 vs. 37.3 ± 9.8 g, P < 0.01) while also reducing carbohydrate oxidation (99.5 ± 30.4 vs. 85.0 ± 28.4 g, P < 0.01). However, the magnitude of the shift on substrate oxidation induced by p-synephrine was small.
Conclusion: Acute ingestion of p-synephrine augments fat oxidation during prolonged and constant-intensity exercise.